package com.zhp.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(urlPatterns = {"/user/*", "/meet/*", "/article/*"}, dispatcherTypes = {DispatcherType.FORWARD, DispatcherType.REQUEST})
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse resp = (HttpServletResponse) response;
        HttpServletRequest req = (HttpServletRequest) request;
        Object userId = req.getSession().getAttribute(req.getSession().getId());
        if (null == userId) {
            //属于没登陆，重定向登录页
            resp.sendRedirect(req.getContextPath() + "/index.jsp");
            return;
        }
        chain.doFilter(req, resp);
    }

    @Override
    public void destroy() {

    }
}
